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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6db6e8d018dddccfc75831539d735b414c452c1ce44ba59e13694b11f237ee66' 
  AND token = 'A7RmzMsB3SkjBfKxKPdS0PwZxjVl1wis2bLWTYVsdOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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