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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd4bca5def6473295eb45db4faa5d89dbcc62bae50d8a0eb850e245e8cd6fe0b' 
  AND token = 'RJS1ZGNWkkiPKmk40CwyO++DPE1FALgioFl5i6WkaGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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