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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f15ecfa523f55ea58502b942a4cdc31b2e29857794c081b24db704b0580576dc' 
  AND token = 'KuWz3bZh8ilnrn+8+OdOa3M45kxrydeHxFXhnOkNbuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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