SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77b963da84391ab0851bf74b22ec446afb48674c2f301ad2001650fc46705f0b' 
  AND token = 'Y5hkr4xhTivB0nmESuO/perPZAqt7K/US+KOJAuceGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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