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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19a37f5780670612e0c80639a195dce8e741db9e5871608633e573faba4c6e8d' 
  AND token = '6V6fzGM4FlSfoop2oBTepRzFsMj8bSu5qLEY1neaOWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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