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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1606dea70b30a44a5d044c9ee59aa4f57eec6191960af068d110e2d3c879f6f' 
  AND token = 'MSKgoV81uQzI0dQNMfoA2U1jA23Iu3C95/6QYm77tGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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