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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c463e28fbf955c0ed821ccd32c97cf2af327ce97c58e48b8d61a530602bb4ca7' 
  AND token = 'ZZ8b9QR5LbiZYXMbtxHvT/Lyn348alrAVuR1chKPsQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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