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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d0eb1a74f0389cf01064754df41bc6e0d09e2d896dc02bb83c60e3afe1d02d8' 
  AND token = '/PoOyKm1QJo/pc5CflVYwfjAaRTtRueHL3fdKBnYic8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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