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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5b1f2ab21ef40ce2b2ed5cd8d3e384a6e248feabdeb1b9bcc35cee82ccb1af4' 
  AND token = 'rjS7xVqkeJk5fEy11YyDzn/YmO8QrSsQsUZ68V30hn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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