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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edc6fb11f1c7f2597b92816a0ceb7dd9d9bc573969cf1bfab51c12f6899e35ac' 
  AND token = 'KjAjegbOt5bXXiemSYTXOpIRdXQPnSZ/8yCnGIjAU24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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