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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39f3515412d351241d8ba0d18a7d466e49b2697d0bffb0f46afbca8f318dbfca' 
  AND token = 'R0bJc85yu6qiQM9zuU0nQygySntPfgXzJYBT8L8dqn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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