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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '755a487ae5281194613769c629ac56ac90f8ceff2c30d2bf799c93d0d8106b4d' 
  AND token = 'T51HrgKoCrfdYbZ23B18LaNqxvKf5r8CraVf5NfjtMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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