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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64fa1118c63d772c9031b40e7e2370890a38ebb1162b69080129a5812eb2c26c' 
  AND token = 'fg1eLUm6BZa8Wgn95xJUkKUNYhMekPkEiGgiGvQRp/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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