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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86f99dc5e417826efd96951eef876e5a31ab88f7823167aa450407e1fce0ce87' 
  AND token = 'bWDegCnYenY/sqNnGBn/mxOWBwDRR8TqCSmYNnVDItI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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