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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adb986877b1ad2b4314e23d7e7ba33e6356f9d76b69fc220aac455799493dc39' 
  AND token = 'ufjBmdchlLsPN5nTb2MAkQrnID8Tk0IKRBQlwVVy3g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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