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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff1c33b2aaf72d6b99391c92fe9d82fae4440510aeab575ae887a9bda639bd88' 
  AND token = 'ONf9rxJh8Q9NBoFf3Y5fAz1VJ/xZHm6H+e0/HhxU75Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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