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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5f1a7b969a0e788dcf95b634b75ac1d15c10e816dfaa26f5bbb885b8b11f30f' 
  AND token = 'rbbLhU4y2XonFsIP0yQXsnvk71FKKeqQVmMaLBPbjpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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