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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f280ece72b83c468b0c6779ff5372bcf7ab210c41fbc9f051de6a33dcd2ada3' 
  AND token = 'RqHSk+m3Cn45K2Vo2926gCXLcsp+i52qx9FQj9p3uKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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