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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61ea385031fd0e0bdd6795cb8d97b51ae001f9afec70cd87c3e1f9a583f62759' 
  AND token = 'WG8RpWdftcAg3cZT+NnFSqi1xiTnMCLCTeaJJlQUnzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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