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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '737a4e56e1449d7f7b70c329b2ef9aecce9df871d678398dfb968902fd1084b5' 
  AND token = 'kZkUwoerkD/tu/pPHQFQ4rxfWpPkK/e5eSB7+a7Q32U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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