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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3359dd917d30a8fc514c561f3156c5726a9d75b17219d6ce6720e0662bfa6ca' 
  AND token = '0Wf+fXDfxzoNzL5YcCnLoTs4r3PHKj4KCr2uAMLAC+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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