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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4d7aeb7a73f76d81af65bdeb3605f0efc77df6f9aeea3a5eb0ee8fbba1613d1' 
  AND token = 'jQsz0zrhR1SQIO2zH8M7Sc/+Zx0HR1zQ/I+ubaEtLOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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