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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e82c238d303a20d22c8400b017e29609816bd87ba4217085b5ed5de32a1b957' 
  AND token = '64djE6N70wKG+BtmT5h69lMItZ4fVzuALSWM37LkCVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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