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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f2ee4d41856a8b5b5d50a2592cf7e19d449aaf06495b47371d413fd0dea5a00' 
  AND token = 'd9aWCIlrdYeS0QwehlQa9ijxISdEIXzmzsa7TXkeDBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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