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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13e0d66c2b5d6230bb40e0b59c3bcae875265016efd7037972742858a15750be' 
  AND token = '3EeqkeGJyL86c7a5DljlzmP9vWJ+Few3kWditoANT6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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