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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b5c8e84bcfe6f532a5589c3187abd9fdce1e7d5246a18bbe6d4a0676707d6b3' 
  AND token = 'mtY1jsTvqP9xkRKZICHVbuAmPSRrs9LAHVuDlV4Pa5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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