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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f39acab808c9d96adc866e6b15dcdb299ccfd979d38755f60996b8020c644ad' 
  AND token = 'v268nmZW06lF4YGNVDz8to3rUA8Y62g1rDhv2BQxzNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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