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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18fcaf3710d1b95a8f75d50f8776ce53a2da5662d3c9c03a3528a70006e89af5' 
  AND token = '22D9m29ZJ0FWVHdGgwPf9GAKQdO/PgwXCtg9degq2W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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