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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e496da95597f261b90af392519036393603d6a06977890b9028abaf75a2ad38' 
  AND token = 'Xq+Nc11fiBEmZD5J4KHFLLJkySvakPQTvaVim60RAN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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