SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d0fd79a65070ba9941b6c099a52f337f433af45b97f3b7468c5e811b084b9ef' 
  AND token = 'VhbB36b6e3qsKnlphfRdyHUgNWtXp+CW8AKZTQDMQ5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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