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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad3b4117674f62f76e538f697ab1dfc306d0efa6b6ea8d4422190059a0a8bb18' 
  AND token = 'KaxNNEI+ru5F6gAobjALKkQBlAJHZQjEPTdKinqSX2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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