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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1638f2a5d48d20da63f82a4915f8cf62806fccf06a70781bbe6ab355c47d2a47' 
  AND token = 'S3HJIux3wGQI8LfnXGXvz7bVVebpm0fOjIm4meRzLcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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