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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17fc422b387c9aee9825cffc17449b755aff12cf457b614e404e038cf4372cfc' 
  AND token = 'FjmaWOYi+u+AcUeISIeVXE9yCtztXJGPMEVIC/u8ZM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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