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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e8df7a8492c1b11310ecddf89fe1a2db95f369bcc7507ed9a300f3a6615602f' 
  AND token = 'WKSLbXHMZ2HqrNiHY4heBZisK7fpg15PEBqY1nzDTcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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