SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f586da0519f9976eb6ac38259ac4834d4024ae50c1ed181e56a6d1517767c559' 
  AND token = 'uYA30ZYj7y0VtW3zryxHSlf3CLrdaP+AV2gCQOvPOXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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