SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41992c3c2975a5587752716f7165837d1a26660c594653e4449b17a8b51d4766' 
  AND token = 'pMeJx/l42TVamz8Uj7QLBsxSQ1vcgTQ9uF3uQqjfPN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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