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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fc2189234931c26a89afa6caf350d486996d5bb69a741743bc552418546b33b' 
  AND token = 'zFgBSuSE+KWr3PduVSCkj9dT6i5XAouos2CRkxk9J3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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