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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35b2c7456463a9ec2d6e73d7c7fd5e554fe0dcf279d95b72bbbad4a8fbb11d42' 
  AND token = 'lztlmlX4TfXMZCfYVRTMav27bPC4ml5ptomLEzpL+7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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