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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ab58075c40cacac568c6410d4a850c79fa982c8257a23bd9481794fd92e9be0' 
  AND token = 'NeB78Im9+s4loH+bEG6VsdZGKTinOz5mNz25eAh2+pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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