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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f953d46676fc4a2a7737f05d09a42fb4f79912e6696acef39ca40893e6dcd8f3' 
  AND token = '1uAmVX14ViQRmCMOpwH2xVFtnfjYi9umG3zRfEkd/o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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