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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '014e1df26da60fdfdf0dc3f2dd1e1848c7ebe5895825e4f259fd967dfaddad63' 
  AND token = '/lTOIEzIe7irS636qIoQc4Gr/DZLoyuUGeUui54OVck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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