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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c1e121490f6c9dc408cc747d0a31ec0a28aa950cdfb565dc8d1e65a77bd4898' 
  AND token = 'b1iZdD63V0E0GJVIR9gBDYNu7TOPe8z2qW6PqPOkM8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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