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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31e3e0824278d36565e068a9cf2b26035fd58b25f93063a692da0ef6c1c88eb3' 
  AND token = 'ORjM/FGoMlSSt9Gakt2nZIAnjhvE5EaR29IbLVXabC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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