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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab7816686a3888ea011fed1a34088dbee2ef5e2ea16c9e8ba109205be6d2284b' 
  AND token = '4Zd/2MjqUz1wKgJbSw/2tKFr1qjLjUp1UgPdGpg8RyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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