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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5358d0d4d06f4deb5cba71adb4681d893475f13fb20194c5e625ca549f690cc1' 
  AND token = 'i5thmbsbTh6o9cqhqKpgscTlIjOF74FWessLl5+UOG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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