SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41dc3f072d5d83e2923b6ecd0a29b3d10fa7af709b196363cc922362fa945526' 
  AND token = 'MkwgmgcJ682PNns/nA2q/p6hvY4hM83l9UZmZtGAaNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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