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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2aa9a6ae126d9dac7410c421e9c3b472b8700fbd7db03edecdd0c550a9c33c26' 
  AND token = '3ft/Uqk1i3ZmZVj7bWnvthfTpjKT0mSpApw5ff1tpss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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