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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19bff636319675ef4c491fdd086ca7e058f2020fa864a2862b7ba949ba2eb911' 
  AND token = 'y2gVgyi1KLk9IRQsXZthe03fQ4y88iENf4nxlFhRTfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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