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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83a515a5166b6cee260a02e719c7550647191c207f46abbe332ee3905e203b06' 
  AND token = '4eCamFAv5fkT15ZRf1k5kB2dhowyGlSK5lWWSpUD7KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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