Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c245c7ab00700bcfdb944dd19594b5dd9256066e43225009298494a9b022b74' 
  AND token = 'WlNBCYElz1oA9M6mkbqWtKmkfuSHv9721yot6q0um2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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