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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95743609e39500e1990fa6e8c95915b62ceac873afed39b24b900d6845e3f922' 
  AND token = 'MRWVRgE6jV9S0faYy/oVZcy6Y6GLo5fGwMADqa2KGHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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