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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0c11992d87d6193bbb03ad5bf98577d9b495992df42a608d02377bc51d0ef79' 
  AND token = 'tUS2bQQCAPdEGrb76dmPpNczUjkUzTrx+zvp4mlbttA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}