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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8ef70cd953f439e2ff71847fd6a2785e8427dae7b377c6ccbe97e39e09ed6e2' 
  AND token = '7fwK2TQz24KA4prhPa4s7VXq9BoY61ClGtL9Lw2RwR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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