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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '568444ebf7b0d7d6f9581e0476beac5a8eebf5b1454a041aae1c5b004a67c35e' 
  AND token = 'DEKIi0tp3jJMKe2DdZV00OuSRvnSi36yfmhFMHEMPeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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