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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57f9d9602251ad47d498e00b39fa3957043ec71c3655fecaf88f034cb71655b5' 
  AND token = 'VehjkPD+r0dOQ7+ibIELBaX0ylb7EcTmMsN4F4TnyPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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