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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf8db4265bfad948477fa60c22f7a6c25ad255043b04abb621b25022a575c1a1' 
  AND token = '3BssL35Sn7wcqboUbumPEHbrE47xEUmlK6EuF8W0Mx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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