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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1df0cba6de48b01d1db4825c6d977b1f06306b54a52e4e3422d2d001d414c77' 
  AND token = 'yU1eWTCWCk/ha22t9DC3mPf8shRxwYRhQY4BandsbV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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