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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6aa756209fda3450d161dce83fe258c4b6c4b8313f993840e143169dfa6bdc5a' 
  AND token = 'TAMgoSboaxDluzQz61v75rnif7UDBAQjA9SDutZjfvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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