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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a48e3d0a6bf28526516f5f3ac94c012ff5ae92de757a0088b8b5a746b8e6daa0' 
  AND token = '9WW97c9LmIx8y4PhYmverZ9+tWiP1d0FbM1o9inqpnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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